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Finding the Fourth Proportional to 91.63, 137.75 and 77.51

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Solution

The fourth proportional to 91.63, 137.75 and 77.51 is: 116.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.63 : 137.75 = 77.51 : x
  2. Step 2: Convert to fraction form
    91.63/137.75 = 77.51/x
  3. Step 3: Cross multiply
    91.63x = 137.75 × 77.51
  4. Step 4: Simplify right side
    91.63x = 10,676.62
  5. Step 5: Solve for x
    x = 10,676.62/91.63
  6. Step 6: Final answer
    x = 116.52

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.